The comparative energetics and growth strategies of sympatric Antarctic and subantarctic fur seal pups at Iles Crozet

Arnould, John, Luque, S. P., Guinet, C., Costa, D. P., Kingston, J. and Shaffer, S. A. 2003, The comparative energetics and growth strategies of sympatric Antarctic and subantarctic fur seal pups at Iles Crozet, Journal of experimental biology, vol. 206, no. 24, pp. 4497-4506, doi: 10.1242/jeb.00703.

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Title The comparative energetics and growth strategies of sympatric Antarctic and subantarctic fur seal pups at Iles Crozet
Author(s) Arnould, JohnORCID iD for Arnould, John
Luque, S. P.
Guinet, C.
Costa, D. P.
Kingston, J.
Shaffer, S. A.
Journal name Journal of experimental biology
Volume number 206
Issue number 24
Start page 4497
End page 4506
Publisher Cambridge University Press
Place of publication Cambrigde, England.
Publication date 2003-11-10
ISSN 0022-0949
Keyword(s) maternal provisioning
metabolic rate
growth strategy
resource partitioning
fur seal
Arctocephalus tropicalis
Summary The period of maternal dependence is a time during which mammalian infants must optimise both their growth and the development of behavioural skills in order to successfully meet the demands of independent living. The rate and duration of maternal provisioning, post-weaning food availability and climatic conditions are all factors likely to influence the growth strategies of infants. While numerous studies have documented differences in growth strategies at high taxonomic levels, few have investigated those of closely related species inhabiting similar environments. The present study examined the body composition, metabolism and indices of physiological development in pups of Antarctic fur seals (Arctocephalus gazella) and subantarctic fur seals (Arctocephalus tropicalis), congeneric species with different weaning ages (4 months and 10 months, respectively), during their overlap in lactation at a sympatric breeding site in the Iles Crozet. Body lipid reserves in pre-moult pups were significantly greater (t28=2.73, P<0.01) in subantarctic (26%) than Antarctic fur seals (22%). Antarctic fur seal pups, however, had significantly higher (t26=3.82, P<0.001) in-air resting metabolic rates (RMR; 17.1±0.6 ml O2 kg-1 min-1) than subantarctic fur seal pups (14.1±0.5 ml O2 kg-1 min-1). While in-water standard metabolic rate (SMR; 22.9±2.5 ml O2 kg-1 min-1) was greater than in-air RMR for Antarctic fur seal pups (t9=2.59, P<0.03), there were no significant differences between in-air RMR and in-water SMR for subantarctic fur seal pups (t12=0.82, P>0.4), although this is unlikely to reflect a greater ability for pre-moult pups of the latter species to thermoregulate in water. Pup daily energy expenditure was also significantly greater (t27=2.36, P<0.03) in Antarctic fur seals (638±33 kJ kg-1 day-1) than in subantarctic fur seals (533±33 kJ kg-1 day-1), which corroborates observations that pups of the former species spend considerably more time actively learning to swim and dive. Consistent with this observation is the finding that blood oxygen storage capacity was significantly greater (t9=2.81, P<0.03) in Antarctic (11.5%) than subantarctic fur seal (8.9%) pups. These results suggest that, compared with subantarctic fur seals, Antarctic fur seal pups adopt a strategy of faster lean growth and physiological development, coupled with greater amounts of metabolically expensive behavioural activity, in order to acquire the necessary foraging skills in time for their younger weaning age.
Language eng
DOI 10.1242/jeb.00703
Field of Research 060803 Animal Developmental and Reproductive Biology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Cambridge University Press
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